Fungicide and method of preparing same



Patented M... s, 1927.

UNITED STATES .PATENT- OFFICE.

10m: 11. nann am) wnmrm S. 33001:, or tannin, ILLINOIS.

:FUHGIGIDE m IETHOD PREPARING SAME.

Drawing.

preparation of sulphur in a very finely di-' vided condition by a simplemethod.

Another object is the preparation of sulphur under controlled conditionsin the form 10 of a paste or powder which is economically transportableand which is immediately soluble or suspensible in water at the point ofuse.

It has long been known to use sulphur as a fungicide. Many diflicultieshave arisen,

however, in the usual course of operation.

Ordinary flowers of sulphur is not appre ciably soluble, and owing tothe large size of the granules is difiicultly' suspensible in aqueoussolutions. For this reason it is i usually preferred to combine it withcalcium hydrate or quicklime in solution to form calcium polysulphid orlime-sulphur. Th1s compound is very stable in the form of solu-.

tions, but when concentrated or dried, it tends to decompose. It istherefore, diflicult to prepare a standard solution which will have apredetermined strength when applied by spraying. a

"According to the present recess, a sulphur mixture is obtained w ich isimmediately reducible to suspension by simple dilution, and whichcontains the sulphur in an available form. Owing to the exoeed inglminute division andgreat re-active power of thesulphur, preparedaccording to this process, we prefer to desi ate it as --active sulphur.The product as its sulphur in immediately available form, and is farmore easily dispersed or suspended. Theprocess consists in the treatmentof the. lime sulphur or calcium polysulphid solution, with an equivalentamount of zinc sulphate. These substances re-act accord ing to thefollowing equation:

cas.+z o.+ s+( )s. The calcium zinc sulphid" and sulphur are all in elydivided form.

substances of production.

Application fled. October 8, 1924. Serial No. 741,478.

An example of asuitable execution of the process is as follows:

To one gallon of standard lime-sulphur solution containing about sixtypercent of calcium polysulphid is added about 7.7 pounds of pure'zincsulphate (ZnSOJH O) product, which is suitably diluted with the .usualagents before use.

It is preferable to execute this re-action on a large scale, so that theuniformity of v I the product may be assured.- The concentrated materialis economically transport- The active sulphur renders the spray highlyeffective and economical. The'other ingredients serve as auxiliaries andas usual spreading and peptizing agents may be added to stabilize thespray, and to extend its action on plant follage and the like.

we claim as new and desire to secure by Letters Patent, is

- 1. The method of preparing a fungicide containing an intimate mixtureof suspended sulphur, zinc sulphide and calciumsul- I If desired, the iHaving thus described the inventiomwhat so preparmg an active for afungicide, the step of effecting a reing active sulfur and zinc sulfideiil susaction between a lime-sulfur solution and a. pended and finelydivided form. I zinc sulfate solution.

A fungicide containing active sulfur, tures. 5 zinc sulfide, and calciumsulfate in sus- 1 pended and finely miivided form. JOHN H. REEDY.-

57 An aqueous fungicidal mixture includ- WILL s. BROCK.

In testlmony whereof We afix our signa- 1W

